- GET /api/scenarios/templates: the 3 era templates (templateStore from
presets/templates/).
- POST /api/scenarios/draft: generateDraft (template + description + year) ->
{ world, checkpoints } (502 on transport failure / unusable world).
- POST /api/scenarios/commit: finalizeWorld (constrained to approved
checkpoints, optionally based on the re-sent draft) -> saved GameState,
returns { id } (a normal game at #/game/<id>).
- scenarioLlm: the deterministic scenario stub under LLM_STUB=1 (distinct
from the untouched turn stub), the live client otherwise.
- jump route: synthesize a minimal Preset for dynamic games (presetId
'dynamic', no static file) so their turns run; genuinely-missing static
presets still 404.
Fixes#52